Ford 7T4Z-6268-A Timing Chain

These engines some how are not easily serviceable and usually they need special tools. Any procedure that requires getting close to the timing chains should be done with caution, and any disassembly must be done with the special tools; otherwise, an engine is doomed. Again, since this is an interference engine design, if the timing chain has broken, there is bound to be valve and possibly piston damage and this will mean that the cylinder heads have to be pulled. Timing is especially tricky, and errors will lead to serious damage to the engine, for instance. Do not perform this procedure unless very comfortable with this type of repair; if in any doubt seek advice from a specialist. Check all work and be absolutely sure that all is correct before trying to switch on the engine. On 2010 and earlier engines, this procedure must be carried out with the engine removed and a pair of narrow-headed camshaft holding tools are needed. On 3.5L and 3.7L engines, the water pump Is located behind the timing chain, and it is convenient to replace the water pump during the timing chain replacement. First, you keep off the negative terminal of the battery, then the valve covers along with the timing chain cover. As for the 2.7L models, replace the old crankshaft pulley bolt, rotate the engine to the direction of the keyway on the crankshaft being in the 11 o'clock position, and be certain that the triangle timing marks on VCT units. Take off the right side tensioner and guide, take the timing chain off the VCT units, and turn over pulley bolt. The same should be done to the left-side chain with the same specification of the alignment of the timing marks. For removing the VCT unit engage the special tool over the camshafts to pull the locking tabs the center bolts of VCT unit and then slide off the VCT unit from the camshafts. Finally for 2010 and earlier 3.5L and 3.7L models replace the crankshaft sprocket bolt, align the engine TDC for the cylinder number 1, and fit the special holding tools for the camshaft. The following should be done: VCT assembly mounting bolts, primary timing chain tensioner and chain should be taken out. For the models produced after the year 2011, make the engine clockwise rotate until the VCT units align themselves to 90 degrees of camshaft position and then remove the tubes of valve train oil and install the two special camshaft locking tools. Take out the principal timing chain and the second timing chains, if they are required. For installation make sure the timing marks are aligned, install new VCT unit center bolts and tighten to the specified torque value. Insert all the other parts in reverse manner, then turn the crankshaft by your hand at least two full turns and check whether there is any do not apply resistance. Last is to fit a new oil filter, replace engine oil and coolant and start the engine let it to warm up to examine any leakage.

Relieve the fuel system pressure, then disconnect the negative battery cable. Loosen the water pump pulley bolts, remove the drivebelt and drivebelt idler pulley, and then remove the water pump pulley. Remove the fuel injection high pressure pump and housing. Remove the crankshaft pulley, ensuring the engine remains at TDC with the valve cover removed. Disconnect the Crankshaft Position (CKP) sensor electrical connector and remove the sensor, noting that a new sensor must be installed each time it is removed, along with a special alignment tool. Remove the power steering hose bracket fastener and bracket from the bottom of the cover. Support the engine from above with an engine support fixture and raise it enough to remove the right engine mount. Unbolt and set aside the power steering pump without disconnecting the hoses, then remove the pump bracket bolts and bracket. Remove the crankshaft front oil seal and the timing cover. Installation is the reverse of removal, ensuring to clean the mating surfaces of all sealant, install the engine cover within ten minutes of applying a 2.5 mm bead of RTV sealant, tighten the bolts in sequence to the torque specifications, install a new crankshaft front oil seal, verify proper crankshaft/camshaft timing, and install a new CKP sensor with the necessary alignment tool, not tightening the sensor mounting bolts until the installation tool is in place. For the timing chain and tensioner, remove the timing cover, compress the timing chain tensioner, and place a pin into the hole to hold it in the compressed position, being cautious to compress only the round plunger and not the ratchet mechanism. Remove the two tensioner mounting bolts and then the tensioner, followed by the loose timing chain guide and timing chain. The left chain guide and camshaft sprockets can be removed if necessary. Remove the camshaft alignment tool if installed, loosen both camshaft phaser and sprocket bolts without removing them, and use a wrench on the hexagonal area of the camshaft to hold it while turning the camshaft sprocket. Install the left chain guide if removed, then the timing chain, followed by the right chain guide. Install the timing chain tensioner and tighten the fasteners to the torque specifications, removing the pin to release the tensioner to engage the chain guide. Install the camshaft alignment tool, hold the camshafts in place with a wrench on the hex surface, and tighten the camshaft sprocket bolts to the torque specifications. Finally, install the timing cover, install the fuel injection pump housing ensuring the camshaft lobe is at its lowest point, and complete the remainder of the installation in reverse order.

Support the engine from above with a support fixture. Raise the engine enough to remove the right engine mount.

Remove the timing chain(s). Install special tool 303-1248 over the camshafts to lock them into place. Remove the VCT unit center bolts and slide the VCT units off of the camshafts. Always replace the VCT unit center mounting bolts.